Statistics Multiple Choice:

1. So far, all of the z- and t- formulas have had in the numerator (top) of the formula and in the denominator (bottom). a) difference in means; pooled error term b) difference in means; expected difference by chance C) difference in variance estimates; standard error of the mean d) difference in variance estimates; pooled error term e) none of the above. 2. If we found that US athletes got more Olympic medals this year than the general population with a p- value less than .05. Which of the following can we conclude? a) if the null hypothesis was true, we would have less than a 5% chance of obtaining data as extreme or more extreme than the observed data b) the effect observed is robust or large c) the alternative hypothesis has more than a 95% chance of being true d) we will not reject the null hypothesis e) none of the above 3. Imagine you want to test whether drivers of sports cars get in more accidents than the general population. Assume past research indicates that the general public gets into an average of 1.6 accidents per year, with a standard deviation of 0.5 accidents. How would you analyze the data? a) with a z-test. b) with a one sample t-test. c) with a paired samples t-test. d) with an independent samples t-test. e) none of the above. 4. You have collected some data on the GPAs of Psychology majors and Biology majors to see if their GPA's differ. How will you analyze your data? a) with a z-test. b ) with a one sample t-test. C) with a paired samples t-test. d) with an independent samples t-test. e) none of the above. 5. Let's say you wanted to test whether people solve a puzzle faster the second time they do it than the first. What kind of analysis would you use? a) with a z-test. ) with a one sample t-test. c) with a paired samples t-test. d) with an independent samples t-test. e) none of the above